Regenerative coke oven



Oct. 16, 1934. c, OTTO "1,977,201

REGENERATIVE COKE OVEN Filed Jan. 11, 1930 gwuantoz CA1 0Z2? Fatenteci Get. 16, 1934 PATNT' FFICE REGENERATIVE COKE OVEN Carl Otto, Essen-Ruhr, Germany Application January 11, 1930, Serial No. 420,047 In Germany May 4, 1929 4 Claims.

'My invention relates to regenerative coke oven provided with oven chambers and heating walls arranged on two opposite sides of each of said chambers subdivided to form vertical heating 'flues, some of the hues of each wall serving alternately as upflow and downflow hues and the remaining hues of each wall serving alternately as downflow and upflow hues and in which the downfiow fines are communicably connected with 'the upfiow fiues at the lower ends of the flues whereby the products of combustion, or. wasteheat gases, which are specifically heavier than the rising hotter gases, may be returned to and circulated through the upflow lines. In particular my invention relates to such an oven provided with a series of alternate horizontally elongated oven chambers and parallel heating Walls therefor, theheating Walls being subdivided to form two groups of vertical lines connected in pairs at their tops and a communicating passage being provided between the pairs of connected flues enabling the products of combustion to be passed from the downfiow fiue to the upflow flue.

One of the objects of my invention is to provide means whereby the communicating passage between vertical upflow and a vertical downflcw flue of a heating wall may be adjusted throughout the widest possible range and the resistance to gas passage thru the flues, which would affect such range of adjustment is removed.

Another object of the invention is to provide means for regulating the inlet openings of fuel gas and air at the foot end of the heating flues, thereby enabling a wide range of adjustment of the lower communicating passage between the fines and removing the resistance to the passage of gas thru the fines.

Another object of the invention is to maintain the lower communicating opening between the 'flues above the inlet openings for fuel gas and air. This construction and arrangement of the lower communicating passage with respect to the inlet openings for fuel gas and air of each heating flue, avoids any influence acting on the entrance of the waste-heat gases from the downfiow lines to the upflow flues.

With the above and other objects in view, my invention consists in the parts, improvements and combinations more fully pointed out hereinafter.

In the drawing, one embodiment of the invention is shown as applied to a horizontal, regenerative coke oven in which the flues of the heating walls are connected in pairs at their tops.

It will be understood the invention may be applied to: other types of ovens and other arrangement of the vertical heating flues.

Figure 1 is a cross-sectional View, in the direction of the oven battery, showing the lower communicating passage of each flue and the inlet openings for air and gas below the passage of a flue.

Figure 2 is a sectional View on the line 22 of Figure 1 in the direction of the oven chambers.

Figure 3 is a horizontal cross-section, on the line 3-3 of Figure 2.

The regenerative coke oven is provided with horizontally elongated oven chambers l and par allel heating walls 2, therefor. Each heating Wall comprises vertical heating flues, some of which serve alternately as upfiow and downfiow flues, while the remaining flues or" a wall serve alternately as downflow and upflow fiues. In the form of the invention illustrated, the heating fiues comprise two groups of vertical fiues 3 and 4, extending in a single row in the direction of the oven chamber, the flues of one group alternating with theflues of the other group. Each group of flues is adapted to serve alternately for inflow or outflow. The fiues are separated by a division wall 5, which extends upwardly from the sole 6 ofthe oven and terminates below the top 7 thereof. The ilues are thus communicably connected in pairs at their tops. Each pair of fiues is separated from its neighboring pairs by means of partition walls 8, extending from the sole 6 to the top 7 of the oven.

Regenerators are provided for supplying preheated fuel gas and preheated air to the flues. As shown the regenerators are located below the oven chambers and are arranged in groups in the direction of the oven battery. The regenerator groups comprise pairs of fuel gas regenerators 9, 10, and pairs of air regenerators 11, 12, al ernating across the battery. As illustrated, the regenerators extend in rows in the direction of the oven chambers, thereby providing individual regenerators for the heating fiues.

Each fuel gas regenerator 10 and each air regenerator 11, is provided respectively with ducts 13, 14, which communicably connect the respective regenerators with one flue of each pair of connected fiues of a heating wall on one side of an oven chamber. Each fuel gas regenerator 9 and each air regenerator 12 is provided respectively with ducts 15, 16, which communicably connect the respective regenerators with one flue of each pair of flues of a heating wall on the opposite side of the oven chamber.

Fuel gas is supplied to the regenerators 9 and 10 from a gas main (not shown) through conduits 15, having branches 16, and air for combustion is supplied thru conduits 17, having branches 18.

The flues 3 and 4, of each pair are communicably connected, as illustrated by means of a lower connecting passage 19, provided in division walls 5, near the foot end of the flues. Thiscommunicating passage may be regulated by means of the long Vertical sliding member 21, which is adapted to be moved vertically in a recess provided at 22 in the oven masonry, by means of a placement member 23, engaging the sliding member 21 and passing thru the recess and projecting below the oven masonry.

By the above described means waste-heat gases or escape gases may be adjustably admitted to" The foregoing construction is well-known and forms no part of the present invention.

The amount of waste heat or escape gas which passes from the downflow flue to the upflow flue is dependent upon the difference in pressure existing between the flue members. The weight of the falling gases in the downflow flue is specifically heavier than that of the hotter rising gases in the flame-enveloped upflow flue and there is, consequently, normally a greater pressure at the foot end of the downflow flue than exists in the upflow flue.

Heretofore the burning gases in the upflow flues have been regulated by means of the known sliding stones provided at the head ends of the heating flues. The adjustment of such sliding stones aflected the flue cross-section and produced a throttling effect and resulted in adjusting the difference in pressures between an upflow flue and a clownflow flue. Throttling of the issuance of burning gases from the upflow flue to the downflow flue increases the pressure in the upflow flue and diminishes the difference in pressure between the upflow and downflow flues. This imposes a limitation upon the regulating range of the lower opening for admitting wasteheat gas to the upflow flue for circulation therethrough. As the throttling at the head end of the flues, by means of the sliding stones, proceeds the resistance to the issuance of burning gases from the upflow flue may become so great as to reach the strength of the difference in pressures between the upflow and downflow flues, and may even surpass this difference. In the first case, even if the lower opening between the flues were fully utilized, there would be no waste-heat gas admitted to the upflow flue from the downfio-w flue, and in the second case, it is possible for the flame to pass directly into the downflow flue.

; My invention overcomes the above disadvantages and provides means whereby the widest possible regulating range of the lower communicating opening is obtained and whereby any influence acting on the waste-heat gas being admitted to the upflow flue is avoided and which enables the full cross-section of the flues to be maintained, so that the passage of burning gases thru the flues is unimpeded and allows the greatest possible difference in pressures between upflow and downflow flues to be obtained.

As shown in the drawing these means comprise pairs of sliding stones 24, 25. Sliding stones 24 are adapted to be moved to regulate the inlet openings of fuel gas ducts 13, 15 and sliding stones 25, are adapted to be moved to regulate the inlet openings of the air ducts 14, 16. The stones may be adjusted in position by means of a rod inserted through inspection opening 26, provided in the top of the oven above each flue and normally closed by a cap 27.

The provision of the adjusting stones for the fuel gas and air inlet openings at the foot end of the flues enables the sliding stones at the head end of the flues to be dispensed with. The full cross-section of the flues may thus be utilized throughout their length so that the burning gases may flow upwardly thru the upflow flues without encountering resistance or throttling, thus enabling the greatest possible difference in pressure between the upflow flue and downflow flue to be obtained. The elimination of the sliding stones at the head end of the flues and the provision of regulating means for the inlet openings at the foot-end of the flues, allows a wide range of adjustment of the lower communicating opening between the flues to be obtained.

Influences which might tend to act on the escape gas admitted to the upflow flue from the downflow flue is avoided byarranging the lower communicating opening between the flues at a greater height from the flue bottom than the inlet openings for fuel gas and air. As illustrated in the drawing this is efiected by arranging the sliding member 21 in the passage so that at its lowermost position the top of the sliding member will be higher than the sliding stones 24 and 25.

The invention has been shown applied to a horizontal, regenerative coke oven provided with vertical twin-flues. However, it will be understood it may be applied to other types of ovens having vertical flues. It may also be employed with ovens in which the vertical flues may not be of the twin-flue type. Nor is the invention confinedto an oven provided with regenerators, or any special arrangement of regenerators for the oven.

What I claim and desire to secure by Letters Patent is:

- 1. In a coke oven: an oven chamber and parallel heating walls therefor arranged on opposite sides of the chamber, each of said walls comprising two series of vertical combustion flues, a flue of one of the series being adjacent to and communicating with a flue of the other series at the tops of the flues, the two adjacent flues having between them a common wall provided near its lower end with a passage communicably connecting them together, ducts for supplying fuel gas and ducts for supplying air to each of the flues at the bottom thereof, and means for regulating the supply of fuel gas and air from said ducts to the flues.

2. In a coke oven: an oven chamber and parallel heating walls therefor arranged on opposite sides of the chamber, each of said walls comprising two series of vertical combustion flues, a flue of one of the series being adjacent to and. communicating with a flue of the other series at the tops of the flues, the two adjacent flues having between them a common wall provided near its lower end with a passage communicably connecting them together, ducts for supplying air and ducts for supplying fuel gas to each of the flues at the bottom thereof, said wall passage being arranged with its lower portion above said supply ducts, and means for regulating the supply of fuel gas and air from the ducts to the flues.

3. in a coke oven: an oven chamber and parallel heating walls therefor arranged on opposite sides of the chamber, each of said walls comprising two series of vertical combustion flues, a flue of one of the series being adjacent to and communicating with a flue of the other series at the tops of the flues, the two adjacent flues having between them a common wall provided near its lower end with a passage communicably connecting them together, ducts for supplying fuel gas and ducts for supplying air to each of the flues at the bottom thereof, means for regulating the cross-sectional area of said wall passage, and means for regulating the supply of fuel gas and air from said ducts to the fines.

4. In a coke oven: an oven chamber and parallel heating walls therefor arranged on opposite sides of the chamber, each of said walls comprising two series of vertical combustion flues, a flue of one of the series being adjacent to and communicating with a flue of the other series at the tops of the flues, the two adjacent flues having between them a common wall and a passage communicably connecting said two flues together at their lower end, ducts for supplying fuel gas and ducts for supplying air to each of the flues at the bottom thereof, a vertically movable damper adapted to regulate the cross-sectional area of said passage, and slide brick dampers adapted to regulate the supply of fuel gas and air from the ducts to the fines.

CARL OTTO. 

